Shedding mechanism for looms for weaving



1'Sept.-3`, l929. E. HoLLlNGwoR'rH 1,726,831

' SHEDDING MECHANISMVFORQ'LOOMS FOR WEVING Filed June 14, 1927 2sheds-sheet 1 Sept. 3, l 929.Y E. HoLLlNGwoRTH 1,726,831

sxmnnrue MEcHANIsM non Locus Fon wmvrne y File June 1'4, 1927 -2Sheets-Sheet 2 arago- Patented' Sept. 3, 1929.

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EBVD-LRD EOLLNG'WORTH, OE 3303039555, ENG-LANE, SSEGTOR T0 CRQM'ETON gr,KATOVJLSS LOM W'GRKS, GE W'QILJC TER, MASSACHUSETTS, A CGEPORATON OFMASSACHUSETTS.

SHEDBNG MECHANS'M FOR- LOOIVES FOB RVEAVNG.

[application filed June le, 1927, Serial No. 198,831, and in GreatBritain June 18, 19%.

The invention relates to loom shedding in a loom for producingT*.i/vilton, Brussels, or mechanism of the tappet and treadle type, andother forni of carpet. has for its object to provide an improved con-Fig. 2 is a partial plan view, and struction or arrangement of mechanismof Fig. 3 a partial sectional end elevation, 5 this type which will beespecially suitable for .looking in the direction of the arrow 3, Figusein looms for weaving heavy fabrics, such ure 2. 00 for instance 1SCal.pet looms. Referring to the drawings, a, a represent ln thearrangement most commonly ein` the healds or harnesses each connected toreployed in such looms a series of cams are sespective upper and lower"li/adding levers cured on a sleeve mounted loosely on li and The crankshaftor the loom is repretoni shaftof the loom, and are driven by meanssented at c, and the left hand end framie at e5 of a gear wheel fast onthe sleeve and meshing a. F or the purposes of the invention an auf;-with a pinion on the loom crank shaft, the iary end frame c is provided,spaced from treadles or jacks being disposed above the ie end frame d bystretchers 7', 7'?.

tappets. This arrangement is found in pracrlhe tapnet shaft is shown atg, journalled at tice to possess certain disadvantages which it itsinner end in the looni frame l and at its 70 is the object of thepresent invention to overouter end in the auxiliary frame c. This comeor remove. shaft g is, as shown, disposed parallel with According to theinvention, the tappets are the crank shaft c and in rear of same atmounted on a short shaft disposed parallel substantially the sainevertical level. Also with the crank shaft at a suitable distance injournalled between the frames d and e, in 7 rear of the line of same andat, or substantialfront of the crank shaft and also at substanly at, thesame vertical level. A pinion fast tially the saine level as the rankshaft is ay on the cranlr shaft meshes with a pinion on a counter shaft,7L carrying a pinion z', with L5 counter shaft disposed in front of theline of which a pinion y' on the crank shaft meshes.

the crank shaft, and another pinion on this A second pinion 7c on thecounter shaft 7L S0 counter shaft meshes with a gear wheel of apmesheswith a gear m on the tappet shaft. propriate ratio fast with thetappets.The The tappets n', n2, for operating two of the tappet levers aredisposed beneath the tappets, healds, say those controlling the twobinder being mounted pivotally at their rear ends warps, are formed onone hloclr n3, and the on a shaft at the rear of the loom. tappet 0 foroperatinry the third heald for the 35 rlhe counter shaft, the shaft onwhich the stuifer warp, is formed on a second block o tappets aremounted and the shaft on which along with a fourth tappet 02 which, inthe the tappet levers are mounted, are all jourinstance shown,is a dummytappet, but serves nailed at their inner ends in the side frame of apurpose mentioned later. The two tappet the loom and at their outer endsin an auxih blocks n3 and 0 are mounted on a boss m fast 90 iary framesuitably spaced from the side with the gear m, and the said blocks arerigframe. idly secured to the gear m by bolts 0. By

The front ends of each adjacent pair of tapforming adj aeent pairs oftappets integral on pet levers are each connected by a chain t0 a oneblock or hub, they can be set or formed pulley or drum mounted to rotatefreely on a to so act upon their respective levers as to shaftjournalled between the loom side and cause the correct movements of aconnected the auxiliary frame, the chain from one lever pair of healds,and can retain this correct setpassing around the pulley in onedirection ting without possibility of displacement such 45 and that fromthe other lever in the opposite as might occur under heavy strain if thedirection, so that as one lever is depressed by tappets were separatelysecured. The pair of its bowl to raise its heald, the other lever istappets on each block are set diametrically correspondingly raised todraw down its opposite to one another. heald, The tappet levers, r, r2r3 and r4, are dis- 50 In the accompanying drawings, posed as shownbeneath the tappets and are Fig. l is a front view of sheddingmechapivoted at their rear ends on a shaft s eXtendnism, according tothe invention, arranged ing between the end frame d and a bracket e foroperating` threev healds, which may consecured to the auxiliary frame e.trol, say, two binder warps and astutfer warp Each of the tappet leversr', r2 and r3 is connected towards its front end, by a verticalconnector t', t2 or t3, adjustable as to length, to its respectiveupper' shedding lever, and by another connector u, u2 or M3, alsoadjustable as to length with the respective lower shedding lever.

rlhe front ends of the pair of tapper levers 1 and r2 are each connectedby a respective chain o or @2 to a pulley or drum U3 rotatable freely ona shaft c4 extending between the frames Z and e, the chain v beingcarried around the pulley in one direction, and the chain o2 in theopposite direction. lt follows, therefore.l that as one of the pair oftappet levers is depressed to raise its heald, the other lever'of thepair is correspondingly raised to draw down its l eald. ln similarmanner the third tappet lever r3 is connected by a chain fw to a pulleyor drum 102, also loose on the shaft v4, and another chain w3 fast tothe drum to2 but passing about it in the opposite direction to the chainw is connected to a tappet lever r4 adapted to be operated by the dummytappet 02. This tappet o2 thus operates to balance the third or oddheald operated by the tappet 0 and tappet lever r3, and to draw down thesaid heald.

Each tappet lever is provided with a bowl e disposed in a central slotor recess e in the lever and mounted to rotate freely on a transversepin z2 extending across the slot. rThe bowls are, as shown, ofrelatively large diameter, and the levers are so shaped that their theyengage, eXert a direct central pressure on the tappet levers, and thispermits of the use of tappets and bowls of relatively large width which,combined with the permissible use of large diameter bowls enables theparts to be of great strength and conduces to ease in working. rThebowls may, if desired, be mounted on ball or roller bearings to minimiZefriction.

The arrangement of the mechanism described eliminates necessity forolf-setting or cranking of the tappet levers employed, and this againadds to the strength. f

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is z- Loom shedding mechanism comprisingharnesses, upper and lower shedding levers for each harness, acrankshaft, a cam shaft positioned at the rear of and substantially onthe level with said crankshaft, al speed reducing gear connectionbetween said shafts, a plurality of external cams mounted in reversepairs on said cam shaft, tappet levers mounted in pairs, extendingtransversely below said shafts and cams and each engaged and actuated inone direction only by one of said cams, connections from each tappetlever to t-he upper and lower shedding levers of one of said harnesses,and cross connections between the two tappet levers operated by a pairof adjacent reversed cams whereby one lever is raised as the other isdepressed by its associated cam, each cam of each pair alternatelymoving two harnesses simultaneously in opposite directions.

In testimony whereof l aiiix my signature.

EDWARD noLLiNewonfri-i.

